Form 1120X 

(Rev. November 2016) 

Department of the Treasury 

Internal Revenue Service 

Amended U.S. Corporation Income Tax Return

▶ Information about Form 1120X and its instructions is at www.irs.gov/form1120x.

OMB No. 1545-0123

For tax year ending

▶

(Enter month and year.) 

Please 

Type 

or 

Print 

Name Employer identification number 

Number, street, and room or suite no. If a P.O. box, see instructions.

City or town, state, and ZIP code Telephone number (optional) 

Enter name and address used on original return. If same as above, write “Same.”

Internal Revenue Service Center 

where original return was filed ▲

Fill in applicable items and use Part II on the back to explain any changes 

Part I Income and Deductions (see instructions) (a) As originally

reported or as 

previously adjusted 

(b) Net change —

increase or (decrease) — 

explain in Part II 

(c) Correct amount 

1 Total income . . . . . . . . . . . . . . 1 

2 Total deductions . . . . . . . . . . . . 2 

3 Taxable income. Subtract line 2 from line 1 . . . . 3 

4 Total tax . . . . . . . . . . . . . . . 4 

Payments and Credits (see instructions) 

5a Overpayment in prior year allowed as a credit . . . 5a 

b Estimated tax payments . . . . . . . . . . 5b 

c Refund applied for on Form 4466 . . . . . . . 5c 

d Subtract line 5c from the sum of lines 5a and 5b . . 5d 

e Tax deposited with Form 7004 . . . . . . . . 5e 

f Credit from Form 2439 . . . . . . . . . . 5f 

g Credit for federal tax on fuels and other refundable 

credits . . . . . . . . . . . . . . . . 5g

6 Tax deposited or paid with (or after) the filing of the original return . . . . . . . . . . . 6 

7 Add lines 5d through 6, column (c) . . . . . . . . . . . . . . . . . . . . . 7 

8 Overpayment, if any, as shown on original return or as later adjusted . . . . . . . . . . 8 

9 Subtract line 8 from line 7 . . . . . . . . . . . . . . . . . . . . . . . . 9 

Tax Due or Overpayment (see instructions) 

10 Tax due. Subtract line 9 from line 4, column (c). If paying by check, make it payable to the 

“United States Treasury” . . . . . . . . . . . . . . . . . . . . . . . ▶ 10 

11 Overpayment. Subtract line 4, column (c), from line 9 . . . . . . . . . . . . . . ▶ 11 

12 Enter the amount of line 11 you want: Credited to 20 Estimated tax ▶ Refunded ▶ 12 

Sign 

Here

Under penalties of perjury, I declare that I have filed an original return and that I have examined this amended return, including accompanying 

schedules and statements, and to the best of my knowledge and belief, this amended return is true, correct, and complete. Declaration of preparer 

(other than taxpayer) is based on all information of which preparer has any knowledge.

▲

Signature of officer Date ▲

Title

Paid 

Preparer 

Use Only

Print/Type preparer’s name Preparer’s signature Date Check if 

self-employed 

PTIN

Firm’s name ▶

Firm’s address ▶

Firm’s EIN ▶

Phone no. 

For Paperwork Reduction Act Notice, see instructions. Cat. No. 11530Z Form 1120X (Rev. 11-2016) 
Form 1120X (Rev. 11-2016) Page 2 

Part II Explanation of Changes to Items in Part I (Enter the line number from Part I for the items you are 

changing, and give the reason for each change. Show any computation in detail. Also, see What To Attach 

in the instructions.) 

If the change is due to a net operating loss carryback, a capital loss carryback, or a general business credit carryback, see 

Carryback Claims in the instructions, and check here . . . . . . . . . . . . . . . . . . . . . . . . ▶

Form 1120X (Rev. 11-2016) 
Form 1120X (Rev. 11-2016) Page 3 

Future Developments

For the latest information about developments related to Form 

1120X and its instructions, such as legislation enacted after they 

were published, go to www.irs.gov/form1120x.

General Instructions 

Section references are to the Internal Revenue Code unless 

otherwise noted. 

Purpose of Form 

Use Form 1120X to: 

• Correct a Form 1120 as originally filed, or as later adjusted by 

an amended return, a claim for refund, or an examination, or 

• Make certain elections after the prescribed deadline (see 

Regulations sections 301.9100-1 through 3). 

Do not use Form 1120X to... Instead, use . . .

Apply for a quick refund of 

estimated tax 

Form 4466, Corporation 

Application for Quick Refund 

of Overpayment of Estimated 

Tax 

Obtain a tentative refund of 

taxes due to: 

• A net operating loss (NOL) 

carryback 

• A net capital loss carryback 

• An unused general business 

credit carryback 

• A claim of right adjustment 

under section 1341(b)(1) 

Form 1139, Corporation 

Application for Tentative 

Refund 

Note: Use Form 1139 only if 1 

year or less has passed since 

the tax year in which the 

carryback or adjustment 

occurred. Otherwise, use Form 

1120X. 

Request IRS approval for a 

change in accounting method 

Form 3115, Application for 

Change in Accounting Method 

When To File 

File Form 1120X only after the corporation has filed its original 

return. Generally, Form 1120X must be filed within 3 years after 

the date the corporation filed its original return or within 2 years 

after the date the corporation paid the tax (if filing a claim for a 

refund), whichever is later. A return filed before the due date is 

considered filed on the due date. A Form 1120X based on an 

NOL carryback, a capital loss carryback, or general business 

credit carryback generally must be filed within 3 years after the 

due date (including extensions) of the return for the tax year of 

the NOL, capital loss, or unused credit. A Form 1120X based on 

a bad debt or worthless security must be filed within 7 years 

after the due date of the return for the tax year in which the debt 

or security became worthless. See section 6511 for more 

details and other special rules. 

Note: It often takes 3 to 4 months to process Form 1120X. 

Private delivery services. Corporations can use certain private 

delivery services designated by the IRS to meet the “timely 

mailing as timely filing” rule for tax returns. See the Instructions 

for Form 1120 for more information.

What To Attach 

If the corrected amount involves an item of income, deduction, 

or credit that must be supported with a schedule, statement, or 

form, attach the appropriate schedule, statement, or form to 

Form 1120X. Include the corporation’s name and employer 

identification number on any attachments. See the instructions 

for the applicable Form 1120 for the tax year of the claim for a 

list of forms that may be required. 

In addition, if the corporation requests that the IRS 

electronically deposit a refund of $1 million or more, attach 

Form 8302, Electronic Deposit of Tax Refund of $1 Million or 

More. 

Tax Shelters 

If the corporation’s return is being amended for a tax year in 

which the corporation participated in a “reportable transaction,” 

attach Form 8886, Reportable Transaction Disclosure 

Statement. If a reportable transaction results in a loss or credit 

carried back to a prior tax year, attach Form 8886 for the 

carryback years. 

Carryback Claims 

If Form 1120X is used as a carryback claim, attach copies of 

Form 1120, page 1 and the tax computation page, for both the 

year the loss or credit originated and for the carryback year. 

Also attach any other forms, schedules, or statements that are 

necessary to support the claim, including a statement that 

shows all adjustments required to figure any NOL that was 

carried back. At the top of the forms or schedules attached, 

write “Copy Only—Do Not Process.” 

Carryback of an eligible small business credit (ESBC). If the 

corporation is an eligible small business (as defined in section 

38(c)(5)(B)) and is using Form 1120X to claim a carryback of an 

unused ESBC, enter “SBJA 2012” at the top of Form 1120X. For 

details and special rules for an ESBC, see the Instructions for 

Form 3800.

Information on Income, Deductions, Tax 

Computation, etc. 

For information on income, deductions, tax computation, etc., 

see the instructions for the tax return for the tax year being 

amended. 

▲!

CAUTION

Deductions for such items as charitable contributions 

and the dividends-received deduction may have to be 

refigured because of changes made to items of 

income or expense.

Where To File 

File this form at the applicable Internal Revenue Service Center 

where the corporation filed its original return. 

Specific Instructions 

Tax Year 

In the space above the employer identification number, enter 

the ending month and year of the calendar or fiscal year for the 

tax return being amended. 

Address 

If the post office does not deliver mail to the street address and 

the corporation has a P.O. box, show the box number instead. 
Form 1120X (Rev. 11-2016) Page 4 

If the corporation receives its mail in care of a third party 

(such as an accountant or an attorney), enter on the street 

address line “C/O” followed by the third party’s name and street 

address or P.O. box. 

Column (a) 

Enter the amounts from the corporation’s return as originally 

filed or as it was later amended. If the return was changed or 

audited by the IRS, enter the amounts as adjusted. 

Column (b) 

Enter the net increase or net decrease for each line being 

changed. Use parentheses around all amounts that are 

decreases. Explain the increase or decrease in Part II. 

Column (c) 

Note: Amounts entered on lines 1 through 4 in column (c) must 

equal the amounts that would be entered on the applicable lines 

of the tax return if all adjustments and corrections were taken 

into account. 

Lines 1 and 2. Add the increase in column (b) to the amount in 

column (a) or subtract the column (b) decrease from column (a). 

Enter the result in column (c). For an item that did not change, 

enter the amount from column (a) in column (c). 

Line 4. Figure the new amount of tax using the taxable income 

on line 3, column (c). Use Schedule J, Form 1120, of the original 

return to make the necessary tax computation. 

Line 5e. Enter the amount of tax deposited with Form 7004, 

Application for Automatic Extension of Time To File Certain 

Business Income Tax, Information, and Other Returns. 

Line 5g. Include on line 5g any write-in credits or payments, 

such as the credit for tax on ozone-depleting chemicals or 

backup withholding. 

Line 8. Enter the amount from the “Overpayment” line of the 

original return, even if the corporation chose to credit all or part 

of this amount to the next year’s estimated tax. This amount 

must be considered in preparing Form 1120X because any 

refund due from the original return will be refunded separately 

(or credited to estimated tax) from any additional refund claimed 

on Form 1120X. If the original return was changed by the IRS 

and the result was an additional overpayment of tax, also 

include that amount on line 8. 

Line 10. Tax due. If the corporation does not use electronic 

funds transfers, including the Electronic Federal Tax Payment 

System (EFTPS), enclose a check with this form and make it 

payable to the “United States Treasury.” 

Line 11. Overpayment. If the corporation is entitled to a refund 

larger than the amount claimed on the original return, line 11 will 

show only the additional amount of overpayment. This 

additional amount will be refunded separately from the amount 

claimed on the original return. The IRS will figure any interest 

due and include it in the refund. 

Line 12. Enter the amount, if any, to be applied to the 

estimated tax for the next tax period. Also, enter that tax 

period. No interest will be paid on this amount. The election to 

apply part or all of the overpayment to the next year’s 

estimated tax is irrevocable. 

Who Must Sign 

The return must be signed and dated by: 

• The president, vice president, treasurer, assistant treasurer, 

chief accounting officer, or 

• Any other corporate officer (such as tax officer) authorized to 

sign. 

If a return is filed on behalf of a corporation by a receiver, 

trustee, or assignee, the fiduciary must sign the return, instead 

of the corporate officer. A return signed by a receiver or trustee 

in bankruptcy on behalf of a corporation must be filed with a 

copy of the order or instructions of the court authorizing signing 

of the return. 

If an employee of the corporation completes Form 1120X, the 

paid preparer’s space should remain blank. Anyone who 

prepares Form 1120X but does not charge the corporation 

should not complete that section. Generally, anyone who is 

paid to prepare the return must sign it and fill in the “Paid 

Preparer Use Only” area. 

See the Instructions for Form 1120 for more information. 

Paperwork Reduction Act Notice. We ask for the information 

on this form to carry out the Internal Revenue laws of the 

United States. You are required to give us the information. We 

need it to ensure that you are complying with these laws and to 

allow us to figure and collect the right amount of tax. 

You are not required to provide the information requested on 

a form that is subject to the Paperwork Reduction Act unless 

the form displays a valid OMB control number. Books or 

records relating to a form or its instructions must be retained as 

long as their contents may become material in the 

administration of any Internal Revenue law. Generally, tax 

returns and return information are confidential, as required by 

section 6103. 

The time needed to complete and file this form will vary 

depending on individual circumstances. The estimated burden 

for business taxpayers filing this form is approved under OMB 

control number 1545-0123 and is included in the estimates 

shown in the instructions for their business income tax return.

If you have comments concerning the accuracy of these time 

estimates or suggestions for making this form simpler, we would 

be happy to hear from you. You can send us comments from 

www.irs.gov/formspubs. Click on “More Information” and then 

on “Give us feedback.” Or you can write to the Internal Revenue 

Service, Tax Forms and Publications, 1111 Constitution Ave. 

NW, IR-6526, Washington, DC 20224. Do not send the tax form 

to this address. Instead, see Where To File, earlier.